Please restart the Pipe Monitor session and set the Filter to "None" if you don't need to filter by name. Alternatively, you can set the name wildcard to * (i.e., an asterisk).

Tech details:

The latest release of IO Ninja contains a regression that results in an exception when setting an empty wildcard as a filter; the log engine remains suspended after this exception, thus resulting in the "empty log" you saw.

Here's how to fix it (until the next release takes care of it):

1. Open <ioninja-dir>/scripts/common/log_MonitorFilter.jnc in any text editor
2. Search for MonitorFilter.setFilter
3. Add the following snippet right before processing the wildcard string:

switch (filterKind) {
case MonitorFilterKind.FileName:
case MonitorFilterKind.ProcessName:
	// <<<<<<<
	if (!filter) {
		m_filterKind = MonitorFilterKind.None;
		break;
	}
	// >>>>>>>

Save the script and restart the Pipe Monitor session (no need to restart the app).

Please let me know if it works for you.