Try this plugin – http://wordpress.org/extend/plugins/proper-network-activation/ – as it worked for me.
(….I have since disabled BLC from network-wide activation & now enabling it site-by-site as I’ve been trying to locate a (new) problem with not being able to log-out on multisite(solution: clear browser cookies…), but when I had it enabled across the whole network it was definitely working fine in conjunction with the “proper network activation plugin” – prior to installing the plugin I had same problem as you, with error messages etc). The plugin will probably be helpful for properly activating other plugins, too.
We’re running into this issue now too, on a Multisite. I installed the Proper Network Activation plugin, Network Deactivated the Broken Link Checker, then re-Activated it, but that error is still there throughout the network:
Broken Link Checker installation failed. Try deactivating and then reactivating the plugin.
Has anyone found a way to fix this? I can’t find any similar plugins for multisite to replace it with, so hoping this one works.
I just ran into this today. I created two new sites yesterday and BLC displayed the error mentioned by malawimama. The workaround is to network deactivate BLC, activate and then deactivate BLC in each site, then re-enable network activate and it all seems to work at at that point. I haven’t confirmed this, but I don’t think BLC is creating the tables it requires at a site level when you add a new site after network activating.
We had to totally uninstall, then activate it manually on each of the 200 websites. I did find that this was the issue with some other plugins too, for different reasons, so it may be a combination of issues. I don’t know (I’m not a programmer).
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