Okular stuck on wrong page size

[oshunluvr]

About two weeks ago, I used Okular to print a photo at 3.5"x5" and ever since then Okular chooses this size as the default.

I cannot get it to change the default. I have printed dozens of documents since then at letter size and every time I have to reset the paper size.

I have checked cups setting for the printer: default is letter
I have checked paperconfig and papersize: letter
LibreOffice prints in letter.
Printer is set to letter

Ideas?

[oshunluvr]

Purged okular, renamed my okular user history and configs. No change.

Launched a different user. No change.

[skyfishgoo]

have you tried opening a normal sized document and then saving it again?

[oshunluvr]

Did that just now. No change.

[oshunluvr]

Update thread title: The above appears to happen with other KDE apps also, like KolourPaint. Non KDE apps appear to function normally.