Unable to complete the submission process for newly uploaded files

Twice in the last two days, I nave attempted to submit new images as a contributor, when the system indicated that it could not save my keywords, titles, etc.  No matter what I changed, it would not allow me to save.  After trying everything else, I attempted to just delete the files, after which I was going to reupload them, but the system prevented me from doing this as well.  Has anyone else run into this problem, and is there a reason or a solution for this happening.  The files I submitted yesterday ultimately let me complete them, but the same thing happened again this evening, and I cannot porceed with submitting them at this time.  Hopefully, somebody else has the answer for why this is happening.  Thank you in advance for your help!