When using Gmail, the first time in a tab (e.g. Inbox, Social, Promotional, and Forums) new messages get a
NEW icon before the subject line of each message that is new since the last time you looked at the folder and, additionally, the folder tabs show a count of new messages. After the new messages are displayed for about two seconds, the
NEW designation is cleared and the tab header count is cleared.
About a week ago, the
NEW designation started returning on messages previously cleared. When viewing messages it would clear, but if I returned back to Gmail later, having left it open in a Chrome tab, the
NEW designation returns on messages that I have not read or not marked with a yellow star. On December 8, 2014 see this on messages going back to around December 3, 2014.
I am running Chrome 39.0.2171.71 (64-bit) on Macintosh OS X Yosemite 10.10.1. I have a bunch of extensions: AdBlock 2.14.4, Copy Without Formatting 0.31, Mailvelope 0.11.0, rbutr 0.9.5.0, ScriptSafe 188.8.131.52, StumbleUpon 184.108.40.206, and Web Developer 0.4.6.
Why has the behavior changed and is there a way to correct it so that messages only show as