Looks like we can't reproduce the issue or there's a problem in the test case provided.
Sencha Premium Member
Design window becomes unusable after creating linked panel classes
Started to reproduce my designer 1 application, but after creating a window and linking a few panel classes to it the design window became unusable. Even closing and opening the project did not fix it.
Tried to generate a project export to unload, except that although it reported it had created one , no export file was created, so just attached screen shot.
It looks promising, but think I'll wait for the next release, definitely would not commit any money for the new version at this stage.
Tony, we will be releasing an auto-update very soon that will be fixing some crashing bugs. Would you be able to share your project and/or provide the steps to reproduce the bug so that we can get it resolved?
Tony although we never got enough information to see if we resolved your issue. We have resolved a number of issues with linked instances. Primarily surrounding usage of Trees. Please report back if this issue returns but the next auto-update I suspect will fix this.