I have a problem with reading the list of files, there are probably too many of them and joomla hangs up blocking the server. In the / scans / directory I have two 42 MB files. Browser opening the list of files "ERROR Integrity" takes almost 8GB of RAM. I do not know if I am accidentally set to show 1000 files at once. How to solve the problem?
To avoid problems like yours I limited the maximun number of files to show to 100 on each page. As you say, I think your issue is related to the size of the files (42MB of plain text are really many many files).
Do you have more than one site stored and Securitycheck Pro is scanning all of them? Remember you can exclude folders into Global Configuration -> File integrity/manager tab -> File/Folder exceptions field. To initialize all your data you can click on the Tasks -> "Initialize data" button; after that configure the exceptions and launch a new task.