Hello Federico,
I've replied to your email, but I'll copy it here as well.
The hangs are because your Mac is going to sleep. When it wakes, the SiliconLabs driver is not waking up which is causing the hang. Set it so just the display goes to sleep but not the computer.
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For the images being double size, it isn?t a problem I?ve seen before, but try creating a new WeatherCat preferences file - if you?ve brought it over from your old Mac, there could be data in the that is causing a problem.
To create a new preferences file:
Quit WeatherCat.
Access your preferences folder by using the Finder's Go->Go To Folder... menu command and enter:
~/Library/Preferences/
Scroll down the list of preferences files until you find the one named:
com.trixology.weathercat.plist
Delete (or rename) this file then reboot the machine and launch WeatherCat.
Note that the reboot after removing the old preferences file is important - without this, the old settings may hang about in memory.
Note that all your preferences will be reset to factory defaults, so make a note of any settings you need to re-enter such as the latitude/longitude etc. before doing this. Also note that it is very important to reboot the machine after removing the existing preferences file. If the settings aren?t set back to factory defaults when you relaunch WeatherCat, then repeat the procedure.---------
For Sylvester, there is a debug command you can enter at the terminal which may work - open terminal.app and enter the following:
defaults write com.apple.accountsd ACOutputLevel 7 && killall -9 accountsd
then launch Sylvester, with any luck it?ll now see your account information.
Apple have a bug for this, but are having trouble fixing the issue.