RE:RE:stock marketThe primary reason is uncertainty. As the debt comes due there is uncertainty on whether or an extension/restructuring can be granted. Also, there are lingering doubts on whether or not the debt can be serviced and/or paid back. The worst case scenarios are a major stock dilution or liquidation of the company's assets.
However, I believe with favorable rough diamond prices, MPVD can overcome these obstacles. And of course this is all IMHO.