I have never had that problem. Have you used other viewers without issue? What did you stitch it with? Have you done lots of sharpening?

Just a few ideas to help you solve your issue.

Looks a bit like a Photoshop bug. Did you resize the panorama in Photoshop? If so, try flattening your panorama before resizing it, and the line should go away.

Yes this is one of the very common new beginner errors from PTGui or from images converted by Pano2VR.
As default they both produce tif as single layers. (with alpha channel)

If you do not flatten this layer before you either resize the equirectangular or use a filter like the Shadow/highlight you will get this line at the 360 wrap ends.

I have as default changed the output to TIF with NO ALPHA CHANNEL in PTgui.
Unfortunately you can not do that in Pano2VR conversion output.

I see this happens constantly with new users and I never understood why the "Layers" output actually exists for normal panoramas. The only time you may need it is in single layers used for use with enblend.
With Pano2VR there is absolutely no reason to make them.


Hans