If I do nothing while waiting for the task pane, all is ok. On the Windows 7 computer, after changing the Office UI Language through the Language Settings Tool, opening Excel and the Code task panel for Script Lab, firstly nothing happens - meaning the task pane window does not appear immediately as usual. However, now, when I switch from one language to another by using the Office Language Settings Tool and then call the Add-In by clicking on Code, I can produce two Excel crash scenarios: On both computers, I switched to all installed Office languages and installed/activated the Script Lab Add-In.

The Office version is Version 1703 Build 7967.2082 on the Windows 7 computer and Version 1702 Build 7870.2038 on the Windows 10 computer. One computer has Windows 7 as OS and the other one Windows 10 as OS (not in the creators update). I have 3 language packs for Office 2016 (English, German and French) installed on two computers. I think, it could be related to the Script Lab Add-in, as it appears when using the Add-In. I noticed Excel Crashes when using Script Lab after changing the UI Language of Excel.

Change language in excel