This is hard to reproduce, but if then following steps have been used:

• start Creator by passing a pro-file on the cmdline after you have at least one other application started which uses GUI
  (reproducing worked best if this was already a compiled project which was using a Qt that is not configured inside Creator)
• Creator should automatically add the used Qt temporarily to it's defined kits
• hit Configure project
• project should be opened inside the Edit view, double click on the pro-file to open it
• try to interact with keyboard (move Cursor, edit the opened file,...)

Current behavior:

• sometimes editor does not respond to keyboard interaction

If you switch to another application to let Creator lose focus and back to gain focus everything works as expected.

Note: Might be related to using Vim mode of Creator.