After upgrading to the beta of 27th April, i get this error when modifying an EasyTime X-Y type sequence:

Steps to reproduce this bug:
1. Adding new points to the EasyTime sequence.
2. Moving one of them around.
Effects:
- EasyTime window can't be accessed via Alt+Tab.
- The error will appear any time one of the points is modified with the mouse, and randomly, with the faders.
- The scene can be lost.
Workaround:
- Edit the .sce file in Notepad/Gvim with the x-y values.
- Don't hover the mouse around the points and move them with the faders, clicking promptly the OK button or move them via TAB.
This didn't happen in the previous beta.