Note: Most of the following is an observation of lenders opinions voiced in the Prosper forums (with sources given). The opinions voiced in the cited threads are the opinions of the individual lenders who posted them.

Looking into the lender section at the Prosper.com forums part of the posting lenders seem to be in open rebellion. Titles of threads from the last two days include "FLASH:Prosper bans $100.000 lender", "Prosper Mng. Living Under a Rock", "Shooting the Messenger", "What happens if Prosper goes under?", "I am done lending on Prosper", "Hello Prosper Moderator", "Lender's WHO are DONE with Prosper", "My letter to Prosper", "Open letter to John Witchel" 

Topics include lack of communication from prosper, failure to adress process problems, banning lenders, closing threads, … .

Posts call for "Class Action Lawsuit", informing Venture Capital firms who funded Prosper about the situation as the lenders posting see it and the call for withrawing funds.

One main cause for the unrest are the low ROIs large long term lenders are experiencing. This post says there are 203 lenders which have loans over 6 month old and more the 25K invested. For these the post says the average estimated ROI is 1.91%.

The result is that some long time lenders churn Prosper.com and stopped investing, while new lenders continue to pour in money.

As the following chart shows the count of lenders who have bid within the last 30 days stalls since April. 

(Source)

A few lenders now express their very legative opinion on Prosper prominently in their signature in every post they make in the Prosper forums. Example

As lenders have started to make fun of Prosper employees or using avatars to create the appearance of beeing a prosper moderator without any apparent reaction of Prosper in their own forums, users start to speculate if Prosper will be forced to close the forums to avoid the negative publicity.