OK, thanks. That one is NOT recognized by VPhot as having WCS, The one with the fits header below is - that one is OK with VPhot. Is there a difference in the WSC-sections? (there are stuff added by AstroImageJ here that I don't understand).
Magnus
SIMPLE = T / Created by ImageJ FITS_Writer
BITPIX = -32 / number of bits per data pixel
NAXIS = 2 / number of data axes
NAXIS1 = 3354 / length of data axis 1
NAXIS2 = 2529 / length of data axis 2
EXTEND = T / FITS dataset may contain extensions
COMMENT FITS (Flexible Image Transport System) format is defined in 'Astronomy
COMMENT and Astrophysics', volume 376, page 359; bibcode: 2001A&A...376..359H
ROWORDER= 'TOP-DOWN' / Row Order
INSTRUME= 'Atik 383L' / CCD Name
TELESCOP= 'Losmandy Gemini' / Telescope name
OBSERVER= 'Unknown ' / Observer name
OBJECT = 'IY_Uma ' / Object name
EXPTIME = 6.000000E+02 / Total Exposure Time (s)
CCD-TEMP= -3.00E+01 / CCD Temperature (Celsius)
PIXSIZE1= 5.400000E+00 / Pixel Size 1 (microns)
PIXSIZE2= 5.400000E+00 / Pixel Size 2 (microns)
XBINNING= 1 / Binning factor in width
YBINNING= 1 / Binning factor in height
XPIXSZ = 5.400000E+00 / X binned pixel size in microns
YPIXSZ = 5.400000E+00 / Y binned pixel size in microns
FRAME = 'Light ' / Frame Type
IMAGETYP= 'Light Frame' / Frame Type
FILTER = 'V ' / Filter
FOCALLEN= 1.76E+03 / Focal Length (mm)
APTDIA = 2.79E+02 / Telescope diameter (mm)
SCALE = 6.329659E-01 / arcsecs per pixel
SITELAT = 55.5481 / geographic latitude of observatory
SITELONG= 13.3647 / geographic longitude of observatory
AIRMASS = 1.0024698847910976 / Target airmass at mid-exposure
OBJCTRA = '10 43 55.94' / Object J2000 RA in Hours
OBJCTDEC= '58 07 31.88' / Object J2000 DEC in Degrees
RA = 1.609831E+02 / Object J2000 RA in Degrees
DEC = 5.812552E+01 / Object J2000 DEC in Degrees
EQUINOX = 2000 / Equinox
CRVAL1 = 1.6098310369E+02 / CRVAL1
CRVAL2 = 5.8125522265E+01 / CRVAL1
RADECSYS= 'FK5 ' / RADECSYS
CTYPE1 = 'RA---TAN' / CTYPE1
CTYPE2 = 'DEC--TAN' / CTYPE2
CRPIX1 = 1.6770000000E+03 / CRPIX1
CRPIX2 = 1.2645000000E+03 / CRPIX2
SECPIX1 = 6.3296592027E-01 / SECPIX1
SECPIX2 = 6.3296592027E-01 / SECPIX2
CDELT1 = 1.7582386674E-04 / CDELT1
CDELT2 = 1.7582386674E-04 / CDELT2
CROTA1 = 8.7754800000E+01 / CROTA1
CROTA2 = 8.7754800000E+01 / CROTA2
DATE-OBS= '2021-02-14T23:42:41.269' / UTC start date of observation
COMMENT Generated by INDI
JD_SOBS = 2459260.487977639 / Julian Date at start of exposure
JD_UTC = 2459260.491449861 / Julian Date (UTC) at mid-exposure
HJD_UTC = 2459260.4953886443 / Heliocentric JD (UTC) at mid-exposure
BJD_UTC = 2459260.49622639 / Barycentric JD (TDB) at mid-exposure
ALT_OBJ = 85.97138249500703 / Target altitude at mid-exposure
AZ_OBJ = 49.891940098519115 / Target azimuth at mid-exposure
HA_OBJ = -0.38823878790103805 / Target hour angle at mid-exposure
ZD_OBJ = 4.028617504992965 / Target zenith distance at mid-exposure
RAOBJ2K = 10.732206666666666 / J2000 right ascension of target (hours)
DECOBJ2K= 58.12551944444444 / J2000 declination of target (degrees)
RA OBJ = 10.754719617321642 / EOD right ascension of target (hours)
DEC OBJ = 58.013652798461955 / EOD declination of target (degrees)
HISTORY Previous Filename = IY Uma_Light_V_600_secs_2021-02-15T00-52-52_001.
HISTORY ... fits
HISTORY Bias corrected with ATIK2_BIAS_median_2021-01-18_bin1.fits
HISTORY Dark corrected with ATIK2_DARK_2020-11-27_300_sec_median_bin1.fits
HISTORY and exposure time scaling factor = 2.0
HISTORY Flat corrected with ATIK2_FLAT_2021-02-15_C11_V_mflat_bin1.fits
END