I was using Anti-Banner, Private Browsing, and Safe Money (enabled but rarely actively used). Disabling these modules made no difference. Exiting Kaspersky made the issue go away, then the issue stayed away for the 10 minutes I was at my computer after restarting Kaspersky and re-enabling these modules. By the next time I used my computer, the issue had returned.
At this point, I have disabled this "Inject script into web traffic to interact with web pages" setting and all three modules. The info bubble for this setting says that it needs to be enabled for these modules to work correctly, so I have not attempted to re-enable these modules.