Once in a while, even after a fresh boot, when I try to play .avi's several will not run and I get the message MMSYSTEM264 -- not enough memory. Some time later, all these files play just fine. What's up?
MX uses MCI drivers supplied by Windows/3rd parties to play back multimedia files. This standard for outdated (mostly used in Windows Media Player up to version 2) for today and probably the drivers are pretty old and just may not work properly with newer/big files. This kind of drivers may be included for backwards compatibility and are often quite buggy.
MX is not the best choice to play back new and huge multimedia files, since it was last updated about 5 years ago, when multimedia content was different.
Got the answer. This problem occurs only when trying to open files that are too many sub-folders deep. When you get up to six deep, MX sometimes has trouble opening files. Five and less seem to present no such problem.