Please open up a separate thread about the slider problem that you are experiencing and give us detailed information and screenshots there as it seems to be a separate issue.
Now regarding the Twitter feed: I asked one of my colleagues and also I myself did a test regarding this and it is working with no problem in both installation of mine and my colleagues and The Grid shows our Twitter feed.
There indeed must be a conflict of some kind on your installation or the way you add the twitter feed. You did not say if you followed the recommendations that my colleague gave regarding the plugin conflict and secret key recreation.
Please remember what did you do that caused such problems? give us more details that might help us identify the possible problem.
The only thing that we can suggest at the moment is:
- Ensure everything is up to date according to our version compatibility list here. Please follow the best practices when updating your theme and plugins. Click here for more information.
- Test for a plugin conflict. You can do this by deactivating all third-party plugins, and see if the problem remains. If it's fixed, you'll know a plugin caused the problem, and you can narrow down which one by reactivating them one at a time.
- If you're using a CDN, please clear the CDN's cache and disable optimization services.
- Increase the PHP Memory Limit of your server. Click here for more detailed information and how to increase the PHP memory limit.