I mention good ...
repeated in linkgrabber links is a known bug that still is not fixed ...
that the list of downloads the program download the same file but different server, it is wrong and this is known and has not been fixed ...
for the server that you should think upsto.re start a new topic in which you indicate links example, error log, and you must send your data via MP login ...
multihosters for special treatment is required, you should also create a new topic and suggest waiting time, so I read some have been discarded multihosters ...
CRC errors are usually caused by blockages that makes antivirus and firewall, sometimes putting a very high number of parts per file or many parallel downloads, produce that error ...
for the case of visual cues, I can not tell if you will ignore or not, maybe these should go in the JD2 feedback thread ...
finally, what I have written here is the result of my experience, reading and proprietary solutions .... I am not supporting or JD programmer, but I like to help ... regards