Sometimes in SharePoint when you are submitting a list form, editing a publishing page and just saving a list item, you will get this message:
“The server was unable to save the form at this time. Please try again“
Many blog posts will tell you to reboot your SharePoint servers, perform IIS resets, change IIS settings and resetting search but sometimes it might just be as easy as an illegal character from a copy/paste. In my client’s case, they kept on copying and pasting from a PowerPoint presentation and had an illegal character. You can see this if you paste it into Notepad first:
Remove the illegal character, and you should be good to go.