Same here.
But have a look at the direct link:
You will find there “s72/”. That creates a thumbnail on picasa side. If you remove it, you get the full sized picture:
Example:
https://lh4.ggpht.com/-DFk6Ys37QqM/TREwovmgtOI/AAAAAAAAAWA/JRxXrbIdy4E/5115109038_505d992e7c_o.jpg
So I dont know where to find the right path generation in the Plugin, but this must be not as difficult.
Hope the developer will develop an update fast ^^
