It was very comfortable to use Greenshot for asking questions on SE since it could upload to imgur, which is the same hosting, used with SE.
Unfortunately, it started to respond with error 403 Forbidden on upload.
Is it possible to fix?
Tried to capture access to URL http://api.imgur.com/2/upload.xml and found response:
<error> <message>API limits exceeded</message> <request>//2/upload.xml</request> <method>get</method> <format>xml</format> <parameters/> </error>
I found that I still can use Greenshot from notebook. Notebook is behind the same NAT, so blocking issues are unprobable.