Leap2A self-import throws warnings

I wanted to import a portfolio into an existing account. I got the following warning messages trying it on 1.10 dev. The import was from a 1.6 Mahara site. I can provide the file (for my own reference, it's kristina_knox_portfolio_20130124.zip). The import succeeded and I had the pages but maybe some things didn't work alright. I did not import any files or the journal. I just imported the pages.

[WAR] 7d (blocktype/externalfeed/lib.php:253) Illegal string offset 'submittedvalue'
Call stack (most recent first):

    log_message("Illegal string offset 'submittedvalue'", 8, true, true, "/home/kristina/code/mahara/htdocs/blocktype/extern...", 253) at /home/kristina/code/mahara/htdocs/lib/errors.php:433
    error(2, "Illegal string offset 'submittedvalue'", "/home/kristina/code/mahara/htdocs/blocktype/extern...", 253, array(size 1)) at /home/kristina/code/mahara/htdocs/blocktype/externalfeed/lib.php:253
    PluginBlocktypeExternalfeed::instance_config_save(array(size 4)) at /home/kristina/code/mahara/htdocs/blocktype/externalfeed/lib.php:572
    PluginBlocktypeExternalfeed::import_create_blockinstance(array(size 3), array(size 11)) at Unknown:0
    call_user_func_array(array(size 2), array(size 2)) at /home/kristina/code/mahara/htdocs/lib/mahara.php:1562
    call_static_method("PluginBlocktypeExternalfeed", "import_create_blockinstance", array(size 3), array(size 11)) at /home/kristina/code/mahara/htdocs/lib/view.php:2919
    View::import_from_config(array(size 11), "2", "leap") at /home/kristina/code/mahara/htdocs/import/leap/lib.php:1000
    PluginImportLeap->import_view_from_request(object(stdClass)) at /home/kristina/code/mahara/htdocs/import/leap/lib.php:969
    PluginImportLeap->import_from_requests() at /home/kristina/code/mahara/htdocs/import/leap/lib.php:318
    PluginImportLeap->do_import_from_requests() at /home/kristina/code/mahara/htdocs/import/index.php:294
    do_import() at /home/kristina/code/mahara/htdocs/import/index.php:76

[WAR] 7d (blocktype/externalfeed/lib.php:253) Uninitialized string offset: 0
Call stack (most recent first):

    log_message("Uninitialized string offset: 0", 8, true, true, "/home/kristina/code/mahara/htdocs/blocktype/extern...", 253) at /home/kristina/code/mahara/htdocs/lib/errors.php:433
    error(8, "Uninitialized string offset: 0", "/home/kristina/code/mahara/htdocs/blocktype/extern...", 253, array(size 1)) at /home/kristina/code/mahara/htdocs/blocktype/externalfeed/lib.php:253
    PluginBlocktypeExternalfeed::instance_config_save(array(size 4)) at /home/kristina/code/mahara/htdocs/blocktype/externalfeed/lib.php:572
    PluginBlocktypeExternalfeed::import_create_blockinstance(array(size 3), array(size 11)) at Unknown:0
    call_user_func_array(array(size 2), array(size 2)) at /home/kristina/code/mahara/htdocs/lib/mahara.php:1562
    call_static_method("PluginBlocktypeExternalfeed", "import_create_blockinstance", array(size 3), array(size 11)) at /home/kristina/code/mahara/htdocs/lib/view.php:2919
    View::import_from_config(array(size 11), "2", "leap") at /home/kristina/code/mahara/htdocs/import/leap/lib.php:1000
    PluginImportLeap->import_view_from_request(object(stdClass)) at /home/kristina/code/mahara/htdocs/import/leap/lib.php:969
    PluginImportLeap->import_from_requests() at /home/kristina/code/mahara/htdocs/import/leap/lib.php:318
    PluginImportLeap->do_import_from_requests() at /home/kristina/code/mahara/htdocs/import/index.php:294
    do_import() at /home/kristina/code/mahara/htdocs/import/index.php:76

[WAR] 7d (artefact/file/lib.php:1130) Undefined property: stdClass::$oldextension
Call stack (most recent first):

    log_message("Undefined property: stdClass::$oldextension", 8, true, true, "/home/kristina/code/mahara/htdocs/artefact/file/li...", 1130) at /home/kristina/code/mahara/htdocs/lib/errors.php:433
    error(8, "Undefined property: stdClass::$oldextension", "/home/kristina/code/mahara/htdocs/artefact/file/li...", 1130, array(size 2)) at /home/kristina/code/mahara/htdocs/artefact/file/lib.php:1130
    ArtefactTypeFile::new_file("/var/lib/maharadata/master/temp/import/ulearn02-14...", object(stdClass)) at /home/kristina/code/mahara/htdocs/artefact/file/lib.php:1169
    ArtefactTypeFile::save_file("/var/lib/maharadata/master/temp/import/ulearn02-14...", object(stdClass), object(User), true) at /home/kristina/code/mahara/htdocs/artefact/file/import/leap/lib.php:464
    LeapImportFile::create_file_from_entry_data(object(stdClass), object(PluginImportLeap), "portfolio:artefact175") at /home/kristina/code/mahara/htdocs/artefact/file/import/leap/lib.php:421
    LeapImportFile::create_file_from_request(object(PluginImportLeap), object(stdClass), 121) at /home/kristina/code/mahara/htdocs/artefact/file/import/leap/lib.php:124
    LeapImportFile::import_folder_and_children_from_request(object(PluginImportLeap), object(stdClass), 120) at /home/kristina/code/mahara/htdocs/artefact/file/import/leap/lib.php:99
    LeapImportFile::import_from_requests(object(PluginImportLeap)) at Unknown:0
    call_user_func_array(array(size 2), array(size 1)) at /home/kristina/code/mahara/htdocs/lib/mahara.php:1562
    call_static_method("LeapImportFile", "import_from_requests", object(PluginImportLeap)) at /home/kristina/code/mahara/htdocs/import/leap/lib.php:293
    PluginImportLeap->call_import_method_plugins("import_from_requests") at /home/kristina/code/mahara/htdocs/import/leap/lib.php:308
    PluginImportLeap->do_import_from_requests() at /home/kristina/code/mahara/htdocs/import/index.php:294
    do_import() at /home/kristina/code/mahara/htdocs/import/index.php:76