I've been reading the posts and noticed that at least a few people have had a problem that i was having. I was able to resolve the issue and wanted to share what i did :
When mIDas is downloaded its icon is the same as a file that is opened with 7zip or winrar (a .jar file) and had to right click on it and select "open with" then selected java to run the program.
PROBLEM WAS THIS : When i ran the program and tried to convert a map it would give me an error before it was even able to start converting. There was also no error log created even though it said that it had created one.
SOLUTION WAS THIS : (i dont know why it would only work like this but it did and i'm happy) Right click the mIDasGOLD .jar file, then click properties, where it says "opens with --- (whatever program opens it)" click the "change..." button and select Java.
After i did this it ran perfectly with the exact same maps i had failed to convert 10 times over and failed every time (i only tried to convert a copy of a map once, when it failed i would delete it and make a new copy) doing this will make all of your other .jar files try to open with java, but once you are finished with mIDas, just change it back.
Lemme know if this has helped. Good luck and good gaming peeps.
*running win 7 32bit, 2 gigs of ddr2, AMD 64x X2 dual core 5600+ 2.90 GHz, Java 1.7.0_11-b21*