I call bull. You get more windows problems because there's so many more windows machines out there. IIRC, windows machines account for 84% of usage, and OS X has about 10%. With those numbers its only natural that you'd see more windows machines, simply because there are more windows machines.
We have a 60/40 split with PC/Mac The Macs are mostly running Adobe and used for design work by a dozen or so clients with another chunk of them us general office machines throughout the rest of out client base. This split has changed from roughly and 80/20 split 4 years ago, the majority of the new Macs wishing the primarily PC using clients are notebooks.