Since I got the mandatory update in summer of 2017, I get at least one Javascript alert message every time on pageload event: "Error: expected expression, got '<' ". I have run a few upgrades since, hopping that this might be fixed by them. Never did. No manual change was performed to generate this error except for the version upgrade. Please, could you help on getting rid of this error message? Thank you. P.S. I'm trying to upload a local printscreen as png image and it's uploading it for minutes. It might not upload it.