I originally (and accidentally) posted my concerns in a thread I found about a nearly identical problem with DVD Architect: https://www.vegascreativesoftware.info/us/forum/cannot-save-project-network-license-error--110145/
Basically, I took my laptop so could work on some dialog editing on my lunch, and I lost 20 minutes of work when I tried to save and Vegas closed with the message "An error occurred while saving one or more files. There is no license to use this software."
I used my phone as a hotspot and triple-checked that my laptop was registered to use the software and was able to do a little bit of work and save it.
Later on, to provide supporting documentation (and to tag screen captures) for the bug, I was able to reproduce it by putting my laptop into Airplane mode. It was at this point that I received a reply from MAGIX:
Thank you for your message.
If the hardware config changed on the system you may be prompted to activate the software again. You may turn off internet access and use the software, but if the connection is disabled, this changes he hardware / system config, causing the software to prompt for activation again.
MAGIX Software GmbH
01067 Dresden - Germany
Managing Director: xx xx, xx xx, xx xx
Commercial Register: Berlin Charlottenburg, HRB 127205
I replied the next day after a little bit of experimentation:
I'm not sure that's the issue; wireless was not disabled when the problem first occurred, only when reproduced it. I just tried to start Vegas away from an access point, and it's asking for me to check my license.
At first I thought that switchable graphics could be triggering the license prompt, but I tried again a few seconds later after turning my phone into a hotspot, and Vegas started without a license prompt.
Today, I lost another few minutes of work when I saved after doing some editing in my kitchen, and I appended the following message to my ticket:
Further evidence that whatever is wrong has absolutely nothing to do with whether or not my wireless is enabled or disable is the fact that the program just crashed with a licensing error while I was connected to my home wifi network.
The only "hardware change" was the fact that I was using onboard sound rather than outputting sound over HDMI like I usually do. I do not believe it is a violation of the license terms if I decide to move my laptop to my kitchen rather than working at my desk.
In retrospect, I feel bad about the sarcasm, but not as bad as I feel about not being able to trust my software.