Worked great before Mt. Lion

In Lion, this app worked very nicely. After upgrading to Mt. Lion, zooming is buggy at best, and I cant navigate through maps; Im stuck at the lower left corner. It will often freeze or hang and cause my fan to go haywire. Please fix these bugs/make it compatible with Mt. Lion! It is a great app when it works, but is crippled until it is fixed.

J. M. H. about Topos US