I cannot add comments to tasks. When I try to do so, a red bar appears at the top of the screen. However, there is no message on the bar.
On May 11, 2018 Producteev will no longer be offering its services. To find out more, please see the announcement blog here: https://community.jivesoftware.com/community/products/producteev/blog/2018/04/09/producteev-services-discontinuing-on-may-11
Therefore, in the mean time, they are providing very little support or effort to bring up the site when it is down.
I recommend switching to Asana, which will allow you to import your Producteev tasks.
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