I am stumped. I've been working on a new wordpress installation. Had a few pitfalls here and there, but have been get everything I want to do to work so far. Today, I installed a new theme, Weaver II Pro, and activated it. Everything seemed fine. I then installed a new plugin, UberMenu, but did not activate it immediately. When I tried to install another plugin, image-horizontal-reel-scroll-slideshow, the install stalled, or failed during or after upload. I just got a blank screen, no title, nothing. When I tried to view installed plugins, same thing, blank screen. The page stops loading, but everyting is blank. Viewing source is also blank, shows 1 empty line.
Trying to troubleshoot I searched for solutions to this, found some simalar, but not exactly the same. Following advice I found that helped others, I checked my wp-content/plugins directory via FTP. The first plugin, UberMenu, was present, but not the latest one I tried to install. I first tried renaming the Ubermenu folder to "deactivate" it, even though I had not activated this plugin after install. No change. I then deleted the UberMenu plugin folder from the directory. After that, I could access plugins.php from the dashboard and see all my previously insatalled plugins. Throughout this, the site appeared to continue to perform normally.
Deducing that UberMenu might have been the culprit, or perhaps corrupted during install, I tried installing the other plugin, image horizontal reel scroll. I tried installing internally from the wordpress plugin directory search. The plugin appeared to install. The INstall Plugin page loads, goes through the usual install steps, gives two links at the bottom "Activate PLugin" or "return to plugin installer". If I click "activate", I get a blank page. If I click "return to installer" I can go to the installer page, but if I try to view installed plugins, I get blank screen.
I have tried several variations, installing from a downloaded .zip file, or from plugin search. No matter what, once I've installed a new plugin, I can no longer access plugins.php. If I delete the new plugin manually through FTP, I can then view the plugins page again.
Thinking the new theme may have been conflicting, I switched back to the previous theme, same problem. Then I switched to Twenty-Eleven theme, still same problem.
Why would I suddenly not be able to add any new plugins? I'm not done developing the page and still would like a few more plugins to make it complete.
I am using WP 3.8.1 Any suggestions would be appreciated.