I am using Krita version "BETA2". The other day, while working on a drawing, I accidentally hit a feature under the "File" category. I am unsure what I hit, but since then, I have been unable to save .kra files as .png, .jpeg, or .psd files. For the PNG in particular, an error message appears saying "cannot export images in this colorspace or channel depth to PNG." Is there a way to undo this? I feel I may have done something to allow "channel depth" or some feature.

Open Image/Properties and check the colorspace and channel depth of your image. You might accidentally have converted your image to something weird -- if so, convert it back with image/convert colorspace.

That works Thanks!