There are some limitations on DLNA, and those are outlined in the manual:
Unfortunately, I don't believe the PC Share Manager software is going to be able to change that limitation. Some formats can FF/RW with streaming, and others can't.
I am seeing that there is a new version of PC Share for my samsung LED tv. I have the Un55B8000. Please tell me that this version resolves the random issues with being able to FF or REW video streamed from a computer! It is so frustrating to be able to skip a head or back on one video file and not the next. There's no rhyme or reason that I can see either! I have been taking some of my movies that I own and converting them to AVI format so I have them at the touch of a button. I can use the exact same process on one movie and create roughly the same file size using the same software with all the same settings and one will allow me to skip ahead and back but the next one will not. Maybe if I knew what the reason was I could learn to avoid it but I have not been able to find any reason for why it happens. So please let this new version of pc share fix this issue. I update the firmware on the tv when ever a new release is available also.
Thanks in advance.