Button disappear on web site
This seems to be a random bug.
Occurs on web pages: click on one project in the left column.
On the right side of the page, the project name appears at the top, with a 'tool' icon on the right. This icon allows to display a contextual menu.
Taks are displayed below.
Sometimes the 'tool' icon does not appear and I can't sort my tasks any longer.
Thank you for your report. So far I couldn't reproduce this issue. The most common reason for such behavior could be corrupted or overloaded browser cache. Please try to clear the cache in your browser and see if the issue persists.
Also, please note that you can sort your tasks by date just by hitting the "s" key while in a project and by priority using the "p" key.