Hi I had a similar problem, evernote would work on my android phone connected to my router via wifi and my pc connected to my router via lan cable but would NOT connect at ALL to my laptop connected to the same router via wifi. no matter what i tried, Internet explorer etc did not work. in fact could not connect to evernote website via IE that was weird. Anyway i figured the problem must be some wifi setting gone awry on my laptop, so i plugged it into router with a lan cable and logged into evernote from app and from ie. worked like a charm everything synced and now it seems to have overcome its reluctance and works on wifi. Hope this helps.