Hi 
Can someone please help me out as I am new to this CCTV lark. I think Iv done ok up to this part 
and now I'm not sure whats going on. 
  
I have a AVTECH KPD675 DVR unit and 3 cameras. Its fully installed and working fine, its also configured for remote viewing through my IP. Thats Fine 
  
The problem is when I run the videoviewer, I can also see live image through this software but What I don’t understand is how to view previously recorded material over the internet with videoviewer. Its Version 0.4.6.3 (1) and I’m on  
a Mac ver 10.6.8 
  
What happens is at the bottom of the videoviewer interface there are 3 icons marked as settings, channels & filter.  In the setting tab I can enter a any date to remotely view that previously recored material but when I press the download tab in the software the screen blinks but all I get is a black screen instead of a seeing playback.  
  
If I do this 4 times to 4 previously recorded clips and try to download another I get a message saying I have reached my limitation ie there are 4 videos already playing, but in reality I have got 4 black screens instead of video playback.  
oh In the left corner I can see a green drop down menu for audio but cannot hear anything. 
  
Can someone tell me whats going on and why pleaase? 
  
Many thanks