I attempted to upgrade one of our systems from mono-2.6.1 to mono-2.10.2. This system constructs a command-line, escapes appropriate characters and instantiates a process using System.Diagnostics.Process. It has been running for over two years. What we discovered after the update was that if the path on the command-line contained spaces (and was correctly escaped) they were removed and thus the process would not be able to find the file. For example: -
given the path /tmp/hello\ world/a.txt the process would report that it had been passed /tmp/helloworld/a.txt
This is most likely because we switched from using glib to our own implementation, eglib. glib had more advanced handling of quoted values but was not actually compatible with MS.NET's Process.Start handling.
I would recommend using double quotes and escaped double quotes, since that's the only escaping that's compatible with MS.NET's Process.Start.
Alternatively you might be able to build Mono against glib.