Hello Bob
Looked at these logs and the first instance of this error actually occurred on my project "DuskDarks". I have pasted the log entries below--not a lot of them, and they do look like the ACP Console entry above. You may have hit the problem--Yes this is a FLI Centerline FW. No conscious updates on my part. We did power cycle the filter wheel, on 0225, but it observed fine that night. Problem started on 0226. We did this because the FW lost home position. Do you find that FLI does automatic filter updates? Also Maxim is 6.16--no conscious changes there on my part. Win10 updates turned off. There are 14 filter positions. Nothing listed at position 13--its just blank.

In Maxim Camera Control, there is a D filter listed. Some filters are blank as they have no filter. No change in slots in the filters. The ACP Submission for the "DuskDark" only uses the Dark filter (CMOS). The OJ287 plan that I pasted before only has D, R, and V (this is from memory--have to double check)

ACP console log opened 27-Feb-2021 02:15:43 UTC
This is ACP version 8.2 (build 6, V8.2 Pre-Release)
Licensed to Gary E Walker
02:15:43 This is AcquireScheduler V8.2.5
02:15:43 Custom image file path/names are in use
02:15:44 Initializing AcquireSupport V8.2.7
02:15:44 Weather safe, server is SRO Roof Status & Weather System
02:15:44 Telescope is ACP->PlaneWave CDK 20 0.5m f/6.8, driver V3
02:15:44 MaxIm DL is version 6.16
02:15:44 Imager is ASCOM
02:15:44 Using focus offsets and star mags from FilterInfo.txt
02:15:44 Selecting filter SI from previous ACP run at 20210226@141220 UTC
02:15:44 Autoguiding is disabled
02:15:44 Calculated unbinned plate scales (arcsec/pix): H = 0.66 V = 0.66
02:15:44 Calculated field of view (arcmin): H = 22.4 V = 22.4
02:15:44 Plate solving with UCAC4 (questionable for pointing)
02:15:44 Scope cannot be synced, so all-sky solving is not useful
02:15:44 ACPS Observation DuskDark(1 of 1)
02:15:44 (belongs to Project DuskDarks, Plan DuskDark)
02:15:44 (turning on sidereal tracking)
02:15:44 Pointing Updates are disabled
02:15:44 (final image plate solving is disabled)
02:15:44 Start slew to DuskDark...
02:15:45 (wait for slew to complete)
02:16:10 (slew complete)
02:16:10 Imaging to 20210226_DuskDark_000sec_D_001_2459272_021610
02:16:11 **Bad filter number 13, returning D.
02:16:11 Switching from D to D filter for imaging
02:16:11 Subscript out of range: 'Util.ScriptCamera.Filter'
ACP console log closed 27-Feb-2021 02:16:11 UTC

I have no idea why its calling out the SI filter. None of these plans call for it.

Right now Scheduler is running the EP Aur plan, listed at 100% complete, but locked up in "Running". Also, cannot change the start stop times as there is no "Save Changes" showing. I did make a mistake and apparently did not update the run before date, so the run date is Feb 28 and the run before date is Feb 27. Could this be the problem also?

BTW: While I am associated with AAVSO and George and AAVSOnet, this is my private install, and not an AAVSO license.

Thanks for your help