Magic Content Wizard uses a combination of server-side script and client-side script. What this means is that we make use of your pc (internet browser) to do some of the work and the server on which the script is hosted to do the rest. This is for a number of good reasons, including lowering the load on the web server in order to leave the smallest footprint possible.
The implication of this is what we depend on the integrity of both the machine (and browser) and internet connection you're running the script from, as well as that of the server the script is installed on. If you experienced a "freeze" of more than a few minutes, then it is safe to assume that the connection between your pc and the server was irreparably severed.
The first thing we recommend that you do is check that your browser itself hasn't frozen (restart it), and make sure that you're not experiencing any problems with your internet connection. You can then restart the run using the same keywords with the "Omit Duplicate Keywords" option enabled. Take note of the last successful post date in the log and choose that date (or the next day) for the start date of the new run. Doing this will allow Magic Content Wizard to continue the run seamlessly from where it left off.