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File Type Is Not Permitted – WordPress 4.9.9 and 5.0.1

Recently updated to WordPress 4.9.9 or 5.0.1 and your CSV file imports for Store Locator Plus® stopped working? You can thank yet another “WordPress security feature” — also known as “backwards compatibility break”.  This “update” came with absolutely no warning to plugin developers.

WordPress 4.9.9 and 5.0.1 break Store Locator Plus® Imports and thousands of other plugins.

This does not affect our MySLP SaaS users thanks to our fully managed software stack, so they can rest easy and continue to import locations.