@lpgalady – this plugin hasn’t been in the repository 2 years (but the original one has)…meaning if you didn’t have issues with that you could go back to it (but you wouldn’t have any of the updated features).
You’re saying your “theme” hasn’t changed at all, but the widget disappeared from front end view. The plugin works, you add the widget from the backend – it just doesn’t appear on the front end. That means some code in your site is likely surpressing it. We fix client sites with issues like this all the time (especially with the last several upgrades of WP).
If your template hasn’t changed, you’ve probabably updated WordPress and all your plugins along the way. Problems and conflicts do occur (especially with older plugins and newer WP updates). So yes, that could occur. Also, we would guess most likely you have a conflict because there hasn’t been any other complaints about the widget disapearring from the front end. If it was a widespread issue, there would be more complaints than yours (with the same issue).
Of course this issue is important (to you), but the type of troubleshooting required to fix it would be something a developer would have to get into your site to do (and find and fix the conflict(s)). If it was a widespread issue, we could of course fix it for all – but we can’t fix individual site issues.
Unless you have an issue that would affect the majority of users (or users of a popular plugin or theme), from your current description your issue is limited to your website.
Sorry we couldn’t be of more help.