I am noticing that on all pages sometimes SharePoint doesn't load web part and displays the following message:
Unable to display this Web Part. To troubleshoot the problem, open this Web page in a Microsoft SharePoint Foundation-compatible HTML editor such as Microsoft SharePoint Designer. If the problem persists, contact your Web server administrator.
Refreshing the page solves this problem.
And another weird behaviour I noticed today. Let's say I have a page in which I have placed Content Editor web part. I open the page and do not turn of my computer and go home. Next day when I check that page again (I don't refresh it, nothing, it's just there already opened which I did yesterday) it shows the above web part error message.
Why is this happening?