Mac OS X 10.14.2 Problem Installing Teensyduino 1.52

[carsten]

Dear all, after many years I wanted to reload some programs on my Teensy 2.0. I needed to install (am still trying to install) Teensyduino 1.52 on a mac book pro running OSX 10.14.2 Mojave. I can install it, but when i run the program to verify it i see the Teensyduino pop up ... but when I press the button, nothing happens.
I have installed: Teensyduino_MacOS_Catalina_Java8u252. (also tried the original 10-15 version)

This is the verbose output i get from the Teensyduino:

00:32:40.374 (ports 2): HID add callback, vid=16c0, pid=0478, ver=0001, loc=14400000, use=ff9c:1b
00:32:40.374 (ports 2): found prior teensy at this loc, age=0.078
00:32:40.374 (ports 2): name: HID=16c0:0478.ff9c.1b (Teensy 2.0) Bootloader
00:39:44.636 (post_compile 1): Begin, version=1.52
00:39:44.889 (loader): Teensy Loader 1.52, begin program
00:39:44.939 (loader): File "Blink.pde.hex". 2878 bytes, 4% used
00:39:44.946 (loader): Listening for remote control on port 3149
00:39:44.947 (loader): initialized, showing main window
00:39:45.045 (loader): remote connection 15 opened
00:39:45.046 (post_compile 1): Sending command: comment: Teensyduino 1.52 - MACOSX (teensy_post_compile)
00:39:45.047 (loader): remote cmd from 15: "comment: Teensyduino 1.52 - MACOSX (teensy_post_compile)"
00:39:45.050 (loader): remote cmd from 15: "status"
00:39:45.055 (loader): HID/macos: attach callback
00:39:45.057 (loader): HID/macos: number of devices found = 1
00:39:45.058 (loader): HID/macos: vid=16C0, pid=0478, page=FF9C, usage=001B, ver=0.01
00:39:45.059 (loader): HID/macos: none of the devices had known usage
00:39:45.059 (post_compile 1): Status: 1, 0, 0, 0, 0, 0, /var/folders/ls/5rqgyc957gs47tz4lhl77mbh0000gn/T/arduino_build_897442/, Blink.pde.hex
00:39:45.059 (post_compile 1): Sending command: dir:/var/folders/ls/5rqgyc957gs47tz4lhl77mbh0000gn/T/arduino_build_617162/
00:39:45.061 (loader): remote cmd from 15: "dir:/var/folders/ls/5rqgyc957gs47tz4lhl77mbh0000gn/T/arduino_build_617162/"
00:39:45.062 (post_compile 1): Sending command: file:sketch_may28b.ino.hex
00:39:45.064 (loader): remote cmd from 15: "file:sketch_may28b.ino.hex"
00:39:45.067 (loader): File "sketch_may28b.ino.hex". 2734 bytes, 4% used
00:39:45.078 (loader): remote cmd from 15: "status"
00:39:45.081 (post_compile 1): Status: 1, 0, 0, 0, 0, 0, /var/folders/ls/5rqgyc957gs47tz4lhl77mbh0000gn/T/arduino_build_617162/, sketch_may28b.ino.hex
00:39:45.081 (post_compile 1): Sending command: auton
00:39:45.081 (loader): remote cmd from 15: "auton"
00:39:45.082 (post_compile 1): Disconnect
00:39:45.097 (loader): remote connection 15 closed
00:39:48.674 (loader): Verbose Info event
00:39:56.165 (ports 2): HID remove callback
00:39:56.165 (ports 2): HID add callback, vid=16c0, pid=0478, ver=0001, loc=14400000
00:39:56.165 (loader): HID/macos: detach callback: is NOT currently open device
00:39:56.165 (ports 2): USB device remove callback
00:39:56.165 (ports 2): remove, loc=14400000
00:39:56.165 (ports 2): usb_remove: usb:14400000
00:39:56.165 (ports 2): del device: location=14400000
00:39:56.423 (ports 2): USB device add callback
00:39:56.423 (ports 2): loc=14400000, vid=16C0, pid=0478, ver=0001, ser=
00:39:56.423 (ports 2): actual serailnum=0
00:39:56.423 (ports 2): found prior teensy at this loc, age=0.258
00:39:56.423 (ports 2): name: [no_device] (Teensy 2.0) Bootloader
00:39:56.424 (loader): remote connection 15 opened
00:39:56.500 (loader): HID/macos: attach callback


Does anybody have any suggestions what else I could do, or what I am doing wrong?

Greetings Carsten