The issue applies to HCL Notes 12.0.1 standard and basic as well as HCL Notes 12.0.2 32/64Bit standard and basic.
When you try to change your signature in the Calendar Profile, you get the error message
Theo Heselmans initially reported this issue last week. HCL provided 1202SHF12_W32 yesterday. I have asked for a 64 bit version but have not yet receiced an answer.
The 32 bit version fixes the issue for the 32 bit client.