Hi Peter,
I have been using registered FSUIPC and particularly Autosave for years with advanced aircraft with no problems other than occasional micropauses (so I increased the time between saves to 300 seconds).
For the last week or so I have had many long pauses that appear to accompany autosaves (by looking at the time on the saved file during a pause). This is happening with the PMDG 737/NGX, PMDG 777, and Level-D 767. Toward the end of the flight the pauses seem to become longer. I know you discourage using Autosave with these aircraft, but I have been flying them for a long time with no problem until recently. I use FSX Steam, in a single install, but I used to have a dual install. The problem may coincide with uninstalling the dual install and then installing Steam alone (note: all the Steam folders now have their normal FSX names and the files are saved to them as they should be). Both the current and previous installations of Steam were/are on my D: drive, which is a 500GB SSD. But the files are saved on C: which is a 500GB normal hard drive. I defragged C: and ran chkdsk on it (no errors found) but the problem didn't go away.
I have the following addons: Active Sky Next and fullscreen.ahk (I always run in windowed mode -- this addon converts the appearance to full screen). I have other addons, but the problem happens when they are not running, and probably happens without ASN.
I have FSUIPC version 4.966c. The problem went away for a few flights when I updated from a previous version (not sure which, but I update fairly frequently) but now it's back. I also noticed that SimConnectStallTime was set to 20 after the most recent update (but it might have been there earlier). I didn't do this as I only found out about this setting a day or so ago by reading posts in your forum. Setting it back to 1 didn't fix the problem.
I use FSUIPC for ailerons, elevators, rudder and throttles on all the above aircraft and the joystick axes are disabled for these functions in FSX. As a side note, recently there have been occasional deletions/rebuilding of the controls.xml file and I have to restore it from a backup.
System is Windows 7 64, I7-200 series, NVidia 560M, 6GB memory, Qosmio laptop.
Thanks very much,
Mike