The highlighted color has no bearing on my system. I’m not sure what green signifies on your system (as the color option is customizeable in the options) but green on my system signifies Pictures and/or lyrics embeded in the MP3. I have not had a problem with any of those files on my system.
I am no 100% sure that large ID3v2 comments cause the crash on my system. Every file it has crashed on had a very large comment field. I deleted the comments on two files Zortam was crashing on and tried to view them in Zortam and had no problems.
It would be nice to see a fix for this bug soon as it is very annoying. I have many files with large comments…. usually placed by the original artist and I’d like to keep them in tact.