Problem:
I use the SlikSVN command line client and Windows 8.1 machine. When I type svn update in any folder, a message box appears that says, "There is no disk in the drive. Please insert a disk into drive F:" I cannot stop or explain why sliksvn pops up this message.
Screenshot:

Question: Do you know what might cause this?
More details:
- After pressing Continue a couple times, it finally does the update.
- It happens for svn update and checkout, but not for svn status and info.
- I have tried clearing my SVN credentials.
- I have tried uninstalling and reinstalling SlikSVN.
- I do a custom install and only install the client and tools.
- I have not noticed that it happens for any other program.
- My computer is just a few weeks old.
- My F: drive corresponds to an SD port on my computer. I have never used that SD port before.
- My SlikSVN version is version 1.8.5-SlikSvn-1.8.5-X64 (SlikSvn/1.8.5) X64 compiled Nov 30 2013, 17:17:43 on x86_64-microsoft-windows6.2.9200
- I reported this using the contact form on the SlikSVN website, but have not received a response yet.
I just checked the SlikSVN site again. On January 18, they uploaded a new version, 1.8.5-1. I did the following:
- Uninstalled version 1.8.5
- Deleted my AppData\Roaming\Subversion folder
- Installed version 1.8.5-1
I no longer get the annoying popup message about drive F:.
As best I can tell, version 1.8.5-1 fixed the problem.