@jamesH
The current version of RT Systems Programming Software (WSC-R8600) is Version 5.00.18
It is riddled with Bugs! Use it and lose your data ... guaranteed!
As of 21st July 2020, since RT released an update to version 5.00.18 I have discovered 5 bugs in the software.
I have uploaded video evidence onto my YouTube Channel.
Sad but very true.
I tried to add 25 channels the other day into Bank 8. That seemed to work until I noticed it also wiped out the first 50 or so channels in Bank 0.
It also did some weird things in other banks by shifting memories up or down.
I've seen the above with several different versions of their R8600 software. I've also seen some pretty bad bugs with the general settings where values are not read or written during upload or download to/from the radio and where values are written to the radio with totally different values than what was read or entered.
The above as well as several other bugs just like you said are what I see as well.
I've reported them before and in some cases, RT did fix a bug and issue an update but it seems as though the program is going in the wrong direction and more bugs are introduced with each new version they release.
I'll still use it very cautiously when I need to do bulk edits or add a group of channels but I find I spent more time going over the data fixing errors the software created than what it would have taken me to add everything in manually with Icom's CS-8600 software.
For the times I do manage to get RT's software to work, I always read both my 8600's into Icom's CS software for backup.
I could not say how many times I've needed to restore my data in the radios using the backups I'd made with Icom's software after RT's softwar fudged it up but it has been a lot.
When RT's software does work, it's features are nice. Especially things like adding a group of memory channels via import or copy and paste or doing bulk edits to existing data. Icom's software is not nearly as versatile as RT's software is supposed to be when it comes to those features.