Originally Posted by
foil
hmm, from FAH faq:
"Open GL games don't work or get minimized when running the FAH graphical client.
OpenGL games don't work or get minimized when running the FAH graphical client. There is a known issue that can occur when running FAH and any other application that uses OpenGL, which are mainly games. This issue is not due to FAH itself, but rather that OpenGL, which is used in the FAH graphical client, does not allow itself to be used by two programs simultaneously. The workaround for this issue is to uninstall the FAH graphical client and install the console client. Thanks to Spectre and ellroy80 for contributing this FAQ entry. "
Might just have been luck that it worked for so long.
Did you update drivers recently when the issue appeared?