Updates relating to this, Vista issues, and the overall SA:MP client:
SA:MP Client 0.2X Update #1 has recently been released. It is on the SA:MP downloads page. A new "Hosted" tab has been added to list servers you are currently hosting, as well as Vista bugs being fixed. Whether the update applies to you or not, I urge you to update to stay up-to-date on this. Someone please update this topic accordingly.