Stellarium worked fine until I loaded "my telescope", which brought the whole system down. I delete S12.4 (twice), removed all files and download again with the same results. Stellarium is no longer on my system. It's a great software package when it works. I'll try downloading it again on the next release
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Are you sure that you have deleted all files, including the whole user data directory/folder?
There is an option to do that when you run the installer.
Also, what do you mean by "load 'my telescope'"? You've tried to use Stellarium to control a telescope?
Stellarium 0.12.4 controls my LX200 and ETX without any bother and my user area is compatible with previous versions. What is your operating system. I can use Linux, Win XP Or Win 7. Just make sure your USB/RS232 adapter is compatible.
Sounds more like you have a cable problem that is possibly shorting the 5 volts. That could be enough to crash a program.