What I did was to replace the /iraf/iraf directory structure with the v2.15 binaries, but leaving /iraf/imdirs intact. I checked the login.cl file and the pointer to imdirs is correct. If I restore the v2.13 structure, from backup, things work fine again (but of course that means I don't have the up-to-date version) So it seems I'm breaking some link or resetting some access privilege by inserting the v2.15 binaries somehow.
I've checked the owner and privileges on the directory and they look OK.
I hope you're not saying you installed only the v2.15 binaries ?? If there are permission or header problems it would be with the image files, not the iraf installation, however you definitely need to do a full install of IRAF and not just update the binaries.
Otherwise, it would help if you could upload the image or at least post an image header.
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