There are a lot of LX3 owners here but i guess they're kind busy

tats the place tat dust love to stay inside.

haha..ya..though..it's not a must to have the cover..
most LX3 users don't have a cover for their hotshoe

hmmmm interesting problem here, maybe u can use a diffuser on Ur flash and slight angle flash it instead of ceiling bounce? or play with white balance setting too if lighting in ur indoor shots have different wb, anyhoo best show some shot sample here may other sifu can help... im just guessing here...

u have to manually set the white balance inside the MENU option to get a correct WB... my friend teach me 1~

I just learn tat, when u're indoor, LX3 has a very bad Auto WB. now i always use the K temperature WB setting.

hmm honestly i see those two pic seems more like influence of the indoor lights colour temp more than effect of flash bounce, imho, i think u just take those with decent exposure and well balance noise/iso, then apply colour filter in adobe or correct the white balance then, snap on raw for better leg room of editing..

actually i learn alot from editing when setting my manual shots now, eg, when u edit exposure or white balance no in a raw pic , write down notes on the everage settings need for shots on tat environment, then next time u can have spot on settings with more exp, i do the same on auto AI shots, snap snap snap, then see exif and from the no: i play around it next time i shoot in manual mode, faster learning process. imho...