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Our version only has some add-ons. They should not cause the issue. It was probably some incompatibility between that Thunderbird version and something on your system.

Unfortunately, TEXTJOIN is not present in SoftMaker Office 2018.
However, it has been recently implemented in our developing version and will be included in our next major version of SoftMaker Office.
As an alternative, maybe the CONCATENATE function will be enough for your purposes.

OK, please send an e-mail to sales(at)softmaker.de and make your request there.

Could you please go to "?" | About | Write system information and send us the sminfo.txt file it generates?

There are 2 ways of having Softmaker Office: a one-time purchase or a subscription (monthly or annual)
NX is the subscription
The advantages of NX are:
1. You can always have the latest version of the software
2. You can have it installed on Windows, Mac, and Linux without paying extra

Could you please send me TextMaker file and some steps for me to reproduce it?
You may post the file here or send it to forum(at)softmaker.de

In the settings folder, there should be a pmfill.dat, this is the file that contains user-defined lists and seems to be scrambled.
Please send me that file (post it here or send it to forum(at)softmaker.de
Afterward, delete the file and the error message will go away.

I forwarded your suggestions to the product manager. Thanks!

Unfortunately, that time can't be adjusted.

Thanks. I'll let you know when the developers answer to my support request.

Thanks Jossi!

Unfortunately, that is not possible.

You should only drag when the + sign appears, otherwise, you'll move the cells.

I'm sorry, but I didn't quite understand your problem.
Could you please send a step by step (bonus for screenshots) and also send the files to forum(at)softmaker.de?

In PlanMaker, at the top right corner you'll find a question mark "?".