Fatal error in wspinny.cpp

Mixxx 1.10.0 x64
Windows 7 64bit on Acer Aspire 5100
KDJ500 midi controller
Hercules Deejay Trim 4&6 external usb soundcard

Not really sure when exactly, but could be after rapidly turning backward/forward of the jog on my midi controller, I got the following error:

Fatal error:

ASSERT: "angle <= 180 && angle <= -180" in file src\widget\wspinny.cpp, line 293

Last lines of logfile (there were thousands of the following Warning lines...)
...
Warning: []: src\engine\enginebuffer.cpp 564 ERROR: filepos_play is not round: 3.50769e+07
Warning: []: src\engine\enginebuffer.cpp 564 ERROR: filepos_play is not round: 3.5078e+07
Warning: []: src\engine\enginebuffer.cpp 564 ERROR: filepos_play is not round: 3.508e+07
Warning: []: src\engine\enginebuffer.cpp 564 ERROR: filepos_play is not round: 3.5081e+07
Warning: []: src\engine\enginebuffer.cpp 564 ERROR: filepos_play is not round: 3.50831e+07
Warning: []: src\engine\enginebuffer.cpp 564 ERROR: filepos_play is not round: 3.50841e+07
Warning: []: src\engine\enginebuffer.cpp 564 ERROR: filepos_play is not round: 3.50872e+07
Warning: []: src\engine\enginebuffer.cpp 564 ERROR: filepos_play is not round: 3.50903e+07
Debug: [Main]: BeatFactory::loadBeatsFromByteArray could not parse serialized beats.
Debug: [Main]: BaseTrackCache(0x1f27cb0) updateIndexWithQuery took 1 ms
Debug: [AnalyserQueue 1]: New BeatGrid
Debug: [Main]: LibraryTableModel(0x2bef340) select() took 269 ms
Debug: [Main]: LibraryTableModel(0x2bef340) select() took 215 ms
Debug: [Main]: LibraryTableModel(0x2bef340) select() took 208 ms
Debug: [Main]: LibraryTableModel(0x2bef340) select() took 208 ms
Debug: [Main]: LibraryTableModel(0x2bef340) select() took 205 ms
Debug: [Main]: BeatFactory::loadBeatsFromByteArray could not parse serialized beats.
Debug: [Main]: BaseTrackCache(0x1f27cb0) updateIndexWithQuery took 1 ms
Debug: [AnalyserQueue 1]: New BeatGrid
Fatal: [Main]: ASSERT: "angle <= 180 && angle >= -180" in file src\widget\wspinny.cpp, line 293