I'm having an issue with a PSD file that occurred when using the Artboard tool. I created at artboard at the dimensions 1900px x 6704px, this however gets converted to 1900% x 6704% at random and if i attempt to resize the artboard, the error box below shows up. Does anybody else have this issue? It's very frustrating and making it near impossible to work on files using artboards. I'm running the latest version of OSX and latest update of Photoshop CC 2018.
Check in your Units and Rulers prefs that you don't have Percent for Ruler units, if you want Pixels for the default in the size field. See attached.
I see that your working on a Recovered file, from a crash I assume, and you may want to work on the original. Don't know if a crash may have screwed up your preferences, but hopefully it's nothing that complicated.