I have the PosSizer add-in installed and clicked on "Pyramiding" for the Position Size. A messagebox pops up "Unhandled Exception etc etc" "Input String was not in correct format". It gives me the choice to Continue or Quit. Problem is, I can't change the Position Size in the drop down, because evertime I click on it it gives me the message box. I tried un-intalling the add-in, but then it says it can't find the DLL. At this point, i don't need pyramiding to work and really don't need the PosSize add-in.... I just need to get WL Pro working again. thx.

Firstly, nothing is crashing and you can continue working, so I corrected the title of your post.

You'd be surprised how easily could some issues be solved by our Knowledge Base, including this one:

(scroll down to) System.FormatException: Input string was not in a correct format

QUOTE:
When you try to bring the Position Size dialog in Wealth-Lab 5.6, you get this error:

I followed the instruction and it's still crashing. I opened a strategy and clicked on a dataset, tried changing the possize and continue to get the messgebox error. WealthLabConfig.txt does not exist on my drive (that was the second alternative). Unless I misunderstand how to open a strategy in multi-symbol backtest mode, it's still crashing.

Additionally, I tried creating new strategy from Rules and get this error message box;

"There were errors attempting to compile the Strategy: error CS1704: An assembly with the same simple name 'MS123.PosSizers,Version=2010.7.15.0, Culture=neutral,PublicKeyToken=null has already been imported. Try removing one of the references or sign them to enable side-by-side.

okay... I found the config file and it looks like it's working now. thx

QUOTE:
Additionally, I tried creating new strategy from Rules and get this error message box;

That's the result of downloading the demo version of the PosSizer library, when the full version was already installed. Remove the demo using Extension Manager.