When I will have more time, I will try different computer regarding my wallet issue. Good luck!
As for sell pressure, i think you missed the point of the fork. Sell pressure and price manipulation comes from many coins in a few concentrated hands (including aggressive CPU mining botnets) who dump on the market. The new algo ensures the same amount of coins are shared among many more miners and we can already see this. Sure price jumps up and down but that's because the market is illiquid, it doesn't require any volume to push it up or down.
You can sell the coins you spent a long time mining and burning electricity for and maybe buy back 10% lower but no one knows if that will happen. I think it's silly, you spend all this time mining it and can't stomach some downside, while the risk/reward from this entry is very high. We are in the same boat remember. Be patient.
Please join discord to get your wallet issue fixed. When we find a solution i'll post it here for others to see.