I haven't checked the other blocks, but updating Coblocks 1.1.1 to 1.1.3 breaks existing Alerts.
This is because the block was originally saved with a custom style (for the custom colors) and now uses the class names.
index.js?ver=1534256213:2 Block validation: Block validation failed for `coblocks/alert` (Object).
Expected:
<div class="wp-block-coblocks-alert is-default-alert aligncenter has-background has-2571-d-4-background-color has-2571-d-4-border-color"><p class="wp-block-coblocks-alert__title has-text-color has-ffffff-color">[object Object]</p></div>
Actual:
<div class="wp-block-coblocks-alert aligncenter" style="background-color:#2571d4;border-color:#2571d4;text-align:center"><div class="wp-block-coblocks-alert__title"><p style="color:#ffffff"><strong>This is an alert title</strong></p></div><p class="wp-block-coblocks-alert__text" style="color:#ffffff">This is an alert description.</p></div>