What is this?
By default, CGWatcher uses
http://coinchoose.com to get a list of coins as well as coin data and profitability values. You can view this data by going to the Settings tab and clicking the Profitability button. By knowing this data, you can then set CGWatcher to mine whichever of your profiles is most profitable automatically if you wish. That is why it says "Coins data for 63 coins updated" every 15 minutes. You can disable or change this in Coin Manager (go to Settings -> Other Tools... -> Manage Coins).
The errors related to ad.txt can be ignored. A user had setup a subdomain for me to use on a hosting account that was he had paid for and no longer needed, therefore going unused (at
http://cgwatcher.cryptocoined.com) and after a year or so his hosting account recently expired. There are backup locations for when this occurs, and the ad.txt information isn't necessary for the program to operate correctly. It's actually just a list of ads - one is displayed for 30 seconds every hour (and can be closed immediately) - which, by the way, I've made no money on. I mention that because recently there were some misconceptions that I'm rolling in money from this. I initially create it to promote CGRemote, and I've also shown ads for projects and services I support. I did plan to offer advertising for a nominal fee, but it was quickly buried by other priorities. The next update will remove this web location as it is no longer active, but until then that debug log entry will be created every so often. It can safely be ignored.
As far as not being able to select PAWN, you can add coins manually in the Coin Manager window. You can also set it to use
http://coinwarz.com as the data provider if you find it has a better list of coins, but it requires an API key (you have to pay for API calls once your initial free ones are used). This API key is required by the coinwarz site operator and I do not make anything from it. I added coinwarz support at the request of many users. We're currently working on creating our own comprehensive list of coins for our software to use instead of depending on these outside operators (though I think they're both great sites).
As for not being able to select the miner, what is the filename of the miner you're using? It's getting tough to keep up with all of these miners. When editing a profile, you can change the filter to "All Files" to select a miner that is not known to CGWatcher. You can also rename the miner's filename to one that CGWatcher does know about - cgminer.exe, bfgminer.exe, sgminer.exe, vertminer.exe. There is some support for new or unknown miners, but I'm sure it can be better. It's mostly cosmetic anyway... all that matters is that their APIs work the same.