garetjax,
I had the same problem as you. Over the past 6 months I've been losing water in my system. There was no indication of any leaks but there was a heavy small of watter wetter. I even went as far as to replace my radiator from a super cube to a black ice extreme while replacing all the silicone hoses. Again no indication of leak and a heavy smell of water wetter.
I replaced the tubes with Tygon a week ago and the smell is gone. Haven't lost any water since then either. I normally lose about an inch a week from the top fill tube.
This is only a guess which may apply to my system (or not). The silicone hose was "sweating" the water out. My case temp is pretty high (40C) due to bad ventilation. I have only the fans pulling air thru the radiator into the case. The only exhaust is the single 80mm fan.
I still have high case temps because I'd rather not add an additional fan. The case is so quiet that the tiny hum of the video card fan bothers me. Maybe going to add a GPU block someday.
Hope this helps.
Mayhem
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