Your forum profile you would need to install the plugins correctly per the documentation I would think here as I have all 3 products we release vb4 plugins installed and see no issues here is a real link you can see to see what I mean. Provided the plugins are installed correctly and all the proper information is filled out in edit integration there should be no errors. View Profile: Chuck S - Reeftalk Forums
Check your vb
technical email that they send you I would assume if your electing to be emailed errors about your forum then you should be getting an email with the exact error.
What do you mean you do not want paypal? You mean you do not want users to pay for ads then turn off payment. If you do not want users to buy ads then you could do a plugin on showphoto to set an option to no I suppose but really can not respond without knowing more about what you mean here.
There is no option to to use the PM system of vbulletin. If your trying to use the vb
pm system then you could need to edit the $postreview variable in showproduct.php to use whatever format the vb
pm link uses. That is not covered under product support.