If you are not already aware the latest version of Chrome browser (Version 54.0.2840.71, possibly others) has introduced a bug or incompatibility with the version of CKEditor used in VB 4.x.

If a user attempts to use the "Reply With Quote" feature on an existing post and begins to type their reply under the existing quote without hitting the Enter key first, the space bar will not work.

The ........

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Original Source: New Posting Features - Chrome Browser Notice (For Quick Reply Editor) - How to fix non-working space bar