🚀 go-pugleaf

First thing is that ATM is really not involved in the font realization and printing functions under Windows 2000/XP. As I hope you already know, ATM Lite 4.1 is used only for support of Multiple Master Type 1 fonts and ATM Deluxe 4.1 also adds font management support. But once fonts are activated, ATM butts out of the picture. Best guess is that you may have blown the cookies of some internal Windows font cache. 

3100+ fonts is a helluva lot of fonts to be simultaneously activated. The idea behind ATM Deluxe is to provide a means by which you can have large numbers of fonts installed, but not all simultaneously active. Does your �proprietary application� really require that all 3100+ fonts be active simultaneously? If so, and you want to prove one way or the other that ATM is not involved with the problem, uninstall ATM and try installing all 3100+ fonts in the standard Windows font window via File=>Install New Font. 

- Dov 

PS: Give us a hint. What type of application would really need that number of fonts simultaneously active other than an application to print font sample books?  (8^)>