Execution Order, will it help?

[kh99]

The execution order only matters for plugins on the same hook location. But yes, of course if you have multiple plugins trying to modify the same functionality (notifications for instance) they could be interfering with each other. Changing the execution order may or may not make a difference depending on exactly what the problem is. In any case if they're all set to 5 then I don't see how experimenting with different values could hurt anything.