Without specifics, it's hard to guess what it might be. I'm only familiar with versions back to about R2009. I assume that's old enough to establish common ground, but without even knowing what sort of plotting operations are being perfomed, I can't say.
As with all cases, if you can't share your specific data, try to make a sufficiently generalized minimal working example that can be used to demonstrate the problem. Oftentimes, the act of trying to create such an example serves as a troubleshooting process in itself.
