Your bloggers’ (and/or service/daemon) associated permissions in regards to RSS feed are not consistent, therefore certain content (graphs *.png’s) will not (do not have permission) to be displayed.
For example with my RSS Reader (digg.com) attached/embedded graphs for “Foxex Nubb” will appear fine (as in i have access to them and i can see them within the rss reader-digg.com), however feed entries published from/by “Currency Cross-Eyed” i do not.
Cannot see embedded charts from:-
Piponomics
Currency Currents
Espipionage
Pippin Aint Easy
Playing with Comdolls
Pip My System
Can see charts fine from:-
Pick of the Day
In regards to other bloggers since i didn’t come across any png charts i dont know whether this issue pertains.
Again, troublesome content just embedded *.pgn graphs
Rgds