hi you wanted to know if and when there was a compatibility issue with other modules?
if and when i use this module together with the One page profile module
http://drupal.org/project/onepageprofile

then i get a color box with some (core) warnings like this :

* warning: Missing argument 2 for user_category_load(), called in /../includes/menu.inc on line 410 and defined in /../modules/user/user.module on line 1131.
* warning: Missing argument 3 for user_category_load(), called in /../includes/menu.inc on line 410 and defined in /../modules/user/user.module on line 1131.
* warning: array_slice() [function.array-slice]: The first argument should be an array in /../modules/user/user.module on line 1144.
* warning: implode() [function.implode]: Invalid arguments passed in /../modules/user/user.module on line 1144.
* warning: Missing argument 2 for user_category_load(), called in /../includes/menu.inc on line 410 and defined in /../modules/user/user.module on line 1131.
* warning: Missing argument 3 for user_category_load(), called in /../includes/menu.inc on line 410 and defined in /../modules/user/user.module on line 1131.
* warning: array_slice() [function.array-slice]: The first argument should be an array in /../modules/user/user.module on line 1144.
* warning: implode() [function.implode]: Invalid arguments passed in /../modules/user/user.module on line 1144.

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both modules work fine when used separately / on there own
p.s.not knew what category to place this post in so i placed this post in bug report but not sure if it is one like i said module works ok with out the other module
keep up the good work !