Help Event Code 72 SmartGuard

Hello.
I have an unusual situation regarding SmartGuard blocking (H5 client). Sometimes players get a block via SmartGuard called event code: 72. SmartGuard support says it's a client problem. As what some know, I deal with modding the client and I make various additions, but with such something I met for the first time. Maybe someone has already met this?

The problem appeared when I added new weapons and leviatan sets to the server. I introduced new recipes (icons and .dat files). Of course, all new items have a different ID than the original ID in H5 (new ID recipes 1950-1970, new ID items 25000-26200). Interestingly there are no client error and server error. 

I am looking for clues about what can cause a smartguard to block.

Thanks for any tips

Edited August 21, 20197 yr by Asuki