onInventoryCraft console spam, why?

Hello, I have been updating my server to 1.2.4 r1 and so far the move went well but I have a msg spamming my console that I could use some help with.

onInventoryCraft is constantly popping and seems to happen more in batches of 5-10 messages evry few minutes. It only says that, nothing else, no error messages explaining it, just that. I am about to go into a bug hunt by selectively disabling plugins until I find it but first, I wanted to know if anyone ever had that / anyone would have any ideas as to where to look at specifically.

I can go out and troubleshoot this in details myself but if anyone had tips, it would save me alot of time and hassle and less server downtime!

Thanks in advance!
SV