From the PC Soft web site
Project editor
During a multi-project search, the WINDEV editor could close without a warning message.
Query editor
In some cases, the following error message could be displayed when executing a query in test mode (via GO): "The version of the WDTool internal component is too old".
Application execution
MDI window: In some cases, the content of MDI child windows could be deleted when the windows were moved.
Static control: When using a 90-degree oriented font, the position of the text could be different from that used in version 25.
Scheduler control: In some cases, it was not possible to select and modify appointments.
Application setup
Live update via HTTP: In some cases, the update present on the server would not be detected and several useless directories would be created on the server.
WLanguage
JSON variable: In some cases, after switching from version 25 to version 26, assigning a JSON variable with a buffer could cause an error.
AssistedInputAdd: This function could have no effect if the test of the added value was different from "Starts with".