Answer:
The "Auto Hide" setting may be active. In this case, please move the mouse over the strip visible on the edge of the window. The tables (or the navigator) should then be displayed again. If this does not solve the problem, you can restore the default settings. Please proceed as follows:
- Close all Dlubal applications.
- Open the registry editor using Start and run regedit.
- Delete the Workspace key of the corresponding Dlubal application under HKEY_CURRENT_USER > Software > Dlubal > [Dlubal Application] > Workspace (for example, restore the German workspace of RFEM 5.xx (64-bit) by deleting the Workspace_DEU_12 key under HKEY_CURRENT_USER > Software > Dlubal > RFEM > 5.xx > 64-bit).