Drop (Prestige) Rune isn't working

it seems that drop (prestige) rune isn't working. tested it few times (tested 1h and 5h drop rune) and adena drop(so item drop aswell) is not increased with the drop rune in the inventory. already sent ticket to support but no response for days. has someone the same problem or just my character is bugged somehow?
i'm really afraid of spending (adena or euro, doesn't matter) for not working things :d

 

What happened to this issue?

Do the runes work as intended and provide double adena + 100% drop/spoil chance increase?

 

Personally I didn't see any problems with the runes. And there are at least 2 things to remember that you might not... Do you bear in mind that if you use a rune being in a pt, the overall drop increase is being divided by the number of party members, as in: ONLY and ONLY when the characters with runes only are in pt (or you are solo) you are experiencing a +100% chances? And, second thing, do you know maths? Cause you sure might overestimate the "drop chance" part.

 

I remember noticing a adenas drop increase when using the rune. Keep in mind that with a 0.00001% loot, you end up with a 0.00002% drop rate. Hard to notice.

Also, Sanek is right :
-2 pt ppl, 1 with rune, 1 w/o : 50% drop increase
-3 pt ppl, 1 with rune, 2 w/o : 33% drop increase
...
...
-7 pt ppl, 1 with rune, 6 w/o : 14% drop increase, which will be extremely hard to notice.