@Crown I've noticed the crash, it has something to do with multiple instances, if you enable "Allow multiple instances" in settings it doesn't crash. So something broke somewhere along the way, I'll fix it.
edit: That bug is now fixed.
Regarding seeking in sound the time IS displaying during seeking...so I'm not sure what you're doing...
The mk2 probably crashed because it happened to match the file signature of some other format. What tune was it, so I can check exactly why?
@bippym
Regarding developing a lzx tool I'm not really up for it. But I used most of the lzx code from xmp
http://xmp.sourceforge.net/ and if you know some c/c++ it isn't that complicated to add some GUI etc.