Update: With old Qt 4.2.3 from Feisty, everything works... The author said, that this bug appears because Qt 4.3 is not compatible with Qt 4.2, he plans to use Qt 4.3 starting with Qtiplot 0.9.2.
Update: With old Qt 4.2.3 from Feisty, everything works... The author said, that this bug appears because Qt 4.3 is not compatible with Qt 4.2, he plans to use Qt 4.3 starting with Qtiplot 0.9.2.