I came across a thread on one of my lists today in which somebody was having problems running 2 different versions of the FreeTextBox assembly in the same /bin directory. The answer to this one is pretty simple. You need to install all versions of the assembly with the GAC (Global Assembly Cache). To do so, you need to change to the directory of each assembly using the command prompt and then run the following command: gacutil /i AssemblyName.dll, where AssemblyName.dll is the name of the assembly. After all versions are installed in the GAC, they are then shared and thus you do not need to keep them in the /bin directory to use them.

R