I had a similar problem last night. Mine occurred nearly every time I wanted to slew somewhere, including the initial star alignment at the start of my session. I looked at the logs for eqmod and found that I was continually hitting horizon limits and the slews were stopped before they started. To go along with this, if I clicked the button in kstars that locked where the scope is pointing to the screen, the location of my scope as kstars sees it would jump to below the horizon and back again. I was able to do some capturing after disabling horizon limits, but this was a work-around. There appears to be a bug introduced in eqmod/indi somewhere. The physical mount was never anywhere near negative ALT. kstars jumped to this location on-screen though.
Jasem, thoughts?
[2021-06-02T22:18:18.833 CDT INFO ][ org.kde.kstars.ekos.align] - "The Mount Model Tool is Starting."
[2021-06-02T22:18:18.835 CDT DEBG ][ org.kde.kstars.ekos.capture] - Align State changed from "Complete" to "Slewing"
[2021-06-02T22:18:18.842 CDT DEBG ][ org.kde.kstars.indi] - ISD:Telescope sending coords RA: "09h 25m 56s" ( 9.43214 ) DE: " 19° 41' 47\"" ( 19.6963 )
[2021-06-02T22:18:18.842 CDT INFO ][ org.kde.kstars.ekos.align] - "Slewing to target coordinates: RA (09h 25m 56s) DEC ( 19° 41' 47\")."
[2021-06-02T22:18:18.886 CDT INFO ][ org.kde.kstars.indi] - EQMod Mount : "[INFO] Starting Goto RA=9.43214 DE=19.6963 (current RA=7.94942 DE=25.2139) "
[2021-06-02T22:18:18.888 CDT INFO ][ org.kde.kstars.indi] - EQMod Mount : "[INFO] GOTO ALign Nearest: delta RA = -0.044212, delta DEC = 0.121204 "
[2021-06-02T22:18:18.889 CDT INFO ][ org.kde.kstars.indi] - EQMod Mount : "[INFO] Aligned Eqmod Goto RA=9.38793 DE=19.8175 (target RA=9.43214 DE=19.6963) "
[2021-06-02T22:18:18.889 CDT INFO ][ org.kde.kstars.indi] - EQMod Mount : "[INFO] Setting Eqmod Goto RA=9.38793 DE=19.8175 (target RA=9.43214 DE=19.6963) "
[2021-06-02T22:18:18.990 CDT INFO ][ org.kde.kstars.indi] - EQMod Mount : "[INFO] Slewing mount: RA increment = -667433, DE increment = 166929 "
[2021-06-02T22:18:19.277 CDT INFO ][ org.kde.kstars.indi] - EQMod Mount : "[INFO] Slewing to RA: 9:25:56 - DEC: 19:41:47 "
[2021-06-02T22:18:19.316 CDT INFO ][ org.kde.kstars.ekos.guide] - "Mount is moving. Resetting calibration..."
[2021-06-02T22:18:19.316 CDT INFO ][ org.kde.kstars.ekos.guide] - "Calibration is cleared."
[2021-06-02T22:18:25.350 CDT INFO ][ org.kde.kstars.indi] - EQMod Mount : "[WARNING] Horizon Limits: Scope at AZ=62.209 ALT=-0.936 is outside limits. Nothing to abort. "
[2021-06-02T22:18:28.658 CDT INFO ][ org.kde.kstars.indi] - EQMod Mount : "[INFO] Iterative Goto (1): RA diff = 9.41 arcsecs DE diff = 0.06 arcsecs "
[2021-06-02T22:18:28.658 CDT INFO ][ org.kde.kstars.indi] - EQMod Mount : "[INFO] Iterative goto (1): slew mount to RA increment = 1226, DE increment = 0 "
[2021-06-02T22:18:29.904 CDT INFO ][ org.kde.kstars.indi] - EQMod Mount : "[INFO] Iterative Goto (2): RA diff = 1.15 arcsecs DE diff = 0.06 arcsecs "
[2021-06-02T22:18:30.030 CDT INFO ][ org.kde.kstars.indi] - EQMod Mount : "[INFO] Telescope slew is complete. Tracking TRACK_SIDEREAL... "
[2021-06-02T22:18:30.033 CDT INFO ][ org.kde.kstars.indi] - EQMod Mount : "[WARNING] Horizon Limits: Scope at AZ=59.693 ALT=-3.352 is outside limits. Abort Tracking. "
[2021-06-02T22:19:02.868 CDT INFO ][ org.kde.kstars.ekos.align] - "The Mount Model Tool is Reset."
[2021-06-02T22:19:02.869 CDT INFO ][ org.kde.kstars.ekos.align] - "Solver aborted after 217.45 seconds."
[2021-06-02T22:19:02.869 CDT DEBG ][ org.kde.kstars.ekos.capture] - Align State changed from "Slewing" to "Aborted"Read More...