Hiya, and sorry to resurrect an older thread, but I just got a Saitek X55 HOTAS and I've run into the same problem with the stick not being recognised. It works fine in DCS World, but trying to program in FSX using FSUIPC has been impossible. I've opened a ticket with MadCatz Tech Support, but just found this in their knowledge-base: http://support.madcatz.com/Knowledgebase/Article/View/486/176/im-running-on-win81-and-when-i-go-to-the-game-controllers--settings-tab-in-the-control-panel-the-throttles-settings-say-it-needs-to-be-calibrated-whats-going-on
It would appear that for FSUIPC to hook the inputs from the stick its necessary for Windows to do its jobs and pick up the inputs in the first place, and Saitek have missed something when creating the drivers. Its obviously an ongoing issue with them, and hopefully they get it sorted soon.
Is everyone above everyone reporting trouble with the X55 and FSUIPC running Windows 8.1 as well?