Yes, that is good point to consider. While hard-drive file storage is immune against reinstallation, the default local storage (inside the extension) gets removed along with an uninstallation. This is also the reason why we highly recommend to keep the automated macro backup activated.
=> What I recommend is to downgrade to an earlier version without uninstalling the current extension first. To do so is easy for Firefox. Just drop the downloaded XPI file on the Firefox window.
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Download and install V9.1.8 - does this solve the issue?
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If not, download and install V6.2.6 - does this solve the issue?