I'm using the original Droid 1. I just tried again and had no problems with the stock browser (which I prefer due to it's speed).
I went to CL and went into "For Sale" and "Bicycle" section. I clicked on "Post" on the upper right hand side. Then it takes me to a page where I log into my account. From there, I pick where I want to post (e.g. Bicycle). A new page opens, just like the one on my computer, where I can post. Below, there are 4 boxes where I can choose a file to upload pics. I click on upload and I get a box asking me where from (e.g. astro, gallery, etc.). I choose gallery. Then it shows me my pics in my gallery and I just click on it. That's it.
Maybe the DroidX is different. I love CL - even with it's "erotic services" censored out (although as of tonight, I don't even see the word censored, it's completely gone). I guess they finally gave in to the "man". A shame.