When problems panel is opened, form modeler is not rendered fully

Description of problem:
When problems panel is opened and new form modeler panel is then opened, it is not rendered fully and it looks that the graphic ends based on how high the Problems panel was resized. Observe the Form Modeler's behavior in the video attached.

Version-Release number of selected component (if applicable):
BPMS 6.0.1 ER1

How reproducible:
Always

Steps to Reproduce:
1. Open Project authoring perspective.
2. Do something to make Problems panel appear (e.g. create new work item, make some mistake in it and save it - as I do in the video)
3. Expand the problems panel
4. Create a new form in form modeler.

Actual results:
Form modeler is not rendered fully - only the part that was not covered by problems panel is visible. Even closing the problems panel does not help.

Expected results:
Form modeler should be rendered fully independent on whether the problems panel is opened or closed.