Thank you for your timely response.
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Regarding the modbus watch list displaying value of 0 instead of expected 1, I checked the log and I saw a 0 saved sometime after the 1 with no source just as you have described. But the LED displaying the output of the bit on the RTU stayed lit, meaning its output has not changed. I have tested other output bits, same symptom. It happens every time. I will search for some other software to independently read the coil status of my RTU to determine where the problem lies.
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I followed your suggestion, disable the data source before editing it. Sure enough, all ports were displayed in the Port list. I will use this work around from now on
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Regarding browser problem, I have tested 1.8 with different browsers (FF 3.0, 3.5, IE 8) on different PCs, all with same results. Above the note, mango recognized the browser and it displayed the same version that I used on the client. If I go back to 1.7, I don't see the problem. I have also tested on 2 different servers, one running FC11 and one running CentOS 5, so it does not appear to be an issue with the server.